The following installation instructions (including specially recorded pictures) refer to the installation of a retrofit kit for a trailer coupling (AHK). Details: AHK retrofit kit suitable for S80 Built 01.99 – 02.06. AHK from Bosal – rigid version purchased at KUPPLUNG.de for 155,00 EURO (Article no. 01.99 – 02.06. AHK from Bosal – rigid version purchased at KUPPLUNG.de for 155,00 EURO (Article no. VV0144). Elektrosatz 13 pollig – specific – incl. NSL shut-off relay – purchased at KUPPLUNG.de for 63,00 EURO (Article no. VV0337). Unlocking by software is NOT REQUIRED ! Installation by VOLVO-MÖHLER in Bremen – duration 2.5 hours – costs = 214,20 EURO. Total cost incl. shipping and 19% fairytale tax = 447,20 EURO (for Volvo = approx.800 – 850 EURO !!!) Now for the actual instruction (do not complain, because it is my first!) First the car is jacked up…(see picture)… who lose weight…